Ngakhale onsewo ndi "C" - owoneka bwino, tsatanetsatane wawo wagawo ndi mphamvu zamapangidwe ndizosiyana kwambiri, zomwe zimakhudza mwachindunji katundu wawo - kunyamula mphamvu ndi kuchuluka kwa ntchito.

Gawo lalikulu la C Channel ndiotentha - adagulung'undisa mbali yofunika. Ukonde wake (gawo ofukula "C") ndi wandiweyani (nthawi zambiri 6mm - 16mm), ndi flanges (mbali ziwiri yopingasa) ndi yotakata ndipo ali ndi otsetsereka (kuti atsogolere kutentha - anagubuduza processing). Kapangidwe kameneka kamapangitsa gawo la mtanda kukhala ndi kukana kopindika kolimba komanso kulimba kwapang'onopang'ono. Mwachitsanzo, 10 # C Channel (yokhala ndi kutalika kwa 100mm) ili ndi makulidwe a ukonde wa 5.3mm ndi m'lifupi mwa flange 48mm, yomwe imatha kupirira kulemera kwa pansi kapena makoma pamapangidwe akulu.

C Purlin, kumbali ina, imapangidwa ndi kupindika kozizira kwa mbale zopyapyala zachitsulo. Gawo lake la mtanda ndi "lochepa kwambiri": makulidwe a ukonde ndi 1.5mm - 4mm, ndipo ma flanges ndi opapatiza ndipo nthawi zambiri amakhala ndi makutu ang'onoang'ono (otchedwa "kulimbitsa nthiti") m'mphepete. Nthiti zolimbitsazi zimapangidwira kuti zikhazikike bwino m'deralo za flanges zopyapyala ndikupewa kupunduka pansi pa katundu wochepa. Komabe, chifukwa cha zinthu zoonda, kukana kwathunthu kwa C Purlin ndikofooka. Mwachitsanzo, C160 × 60 × 20 × 2.5 C Purlin (kutalika × flange m'lifupi × ukonde kutalika × makulidwe) ali ndi kulemera okwana pafupifupi 5.5kg pa mita, amene ndi opepuka kwambiri kuposa 10# C Channel (pafupifupi 12.7kg pa mita).